Speed browser = memory usage, CPU and disk

I have a Asus laptop with Intel Core i3 2.4 Gh, 4 GB of RAM (one year old). When you open some web pages 6-10, with 3 expands (AdBlock, Ghostery, WOT) RAM usage, disk and CPU has increased by about 20% compared with the same in Chrome plugins and the same parties. This is definitely not a faster browser than Chrome, and certainly not in this version. That's why I'm waiting for updates.